A 1D Model for Diesel Sprays under Reacting Conditions 2015-24-2395
In this paper, a new 1D combustion model is presented. It is expected to combine good predictive capacities with a contained CPU time, and could be used for engine design. It relies on a eulerian approach, based on Musculus 1D transient spray model. The latter has been extended to model vaporizing, reacting sprays. The general features of the model are first presented. Then various sub models (spray angle and dilatation, vaporization, thermodynamic properties) are detailed. Chemical kinetics are described with a global scheme to keep computational time low.
The spray discretization (mesh) and angle model are first discussed through a sensitivity analysis.
The model results are then compared to experiments from ECN data base (SANDIA) realized in constant volume bombs, for both inert and reacting cases. Some detailed analysis of model results are performed, including comparisons of vaporizing and non-vaporizing cases, as well as inert and reacting cases. Finally some parametric studies are presented, involving the injection pressure, fuel temperature, ambient density, temperature and O2 concentration. The evolutions of spray vapor penetration, liquid length, lift-off length and ignition delay are studied, as well as bomb pressure evolutions. Quantitative and qualitative agreements are discussed.